[ Vocabulary ]
A group in a scientific experiment that serves as a reference for comparison to the experimental group; a group that is untreated by the factor being tested.
A. variable
B. trials
C. control group
D. field study

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Grammar: Adjectives & PrepositionsThere is, There are, Some, AnyModals for DeductionPassive Voice - Present TensesSimple Past Tense and Past Perfect TenseConditional Sentences and Verb FormModals for Advice, Obligation/Prohibition, Necessity and Lack of NecessityPassive VoicesPresent SimpleVerb PhraseOther quiz:
Grammar › ViewMiss Salsa is a teacher. She …… everyday at school.
A. Teach
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A. on
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Chemistry, Sue’s favorite subject, is easy for her.
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